*{
    margin: 0;
    padding: 0;
    list-style: none;

}
.ul-container{
    width: 250px;
    margin: 50px auto;
}
.firstMenu{
    margin-bottom: 5px;
    cursor: pointer;
}
.firstMenu h2{
    background-color: skyblue;
    font-size: 18px;
    height: 35px;
    line-height: 35px;
    padding-left: 10px;
}
.firstMenu ul{
    background-color: lightcyan;
    font-size: 15px;
    height: 0;
    overflow: hidden;
}

.secMenu{
    height: 30px;
    line-height: 30px;
    padding-left: 15px;

}
.firstMenu .actived{
    height: auto;
}